package com.sky.service.impl;

import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import com.sky.constant.MessageConstant;
import com.sky.constant.PasswordConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.EmployeeDTO;
import com.sky.dto.EmployeeLoginDTO;
import com.sky.dto.EmployeePageQueryDTO;
import com.sky.entity.Employee;
import com.sky.exception.AccountLockedException;
import com.sky.exception.AccountNotFoundException;
import com.sky.exception.PasswordErrorException;
import com.sky.mapper.EmployeeMapper;
import com.sky.result.PageResult;
import com.sky.result.Result;
import com.sky.service.EmployeeService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;
import org.springframework.util.ObjectUtils;

import java.time.LocalDateTime;
import java.util.List;
import java.util.Objects;

@Service
public class EmployeeServiceImpl implements EmployeeService {

    @Autowired
    private EmployeeMapper employeeMapper;

    /**
     * 员工登录
     *
     * @param employeeLoginDTO
     * @return
     */
    public Employee login(EmployeeLoginDTO employeeLoginDTO) {
        String username = employeeLoginDTO.getUsername();
        String password = employeeLoginDTO.getPassword();

        //1、根据用户名查询数据库中的数据
        Employee employee = employeeMapper.getByUsername(username);

        //2、处理各种异常情况（用户名不存在、密码不对、账号被锁定）
        if (employee == null) {
            //账号不存在
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        }

        //密码比对
        // 后期需要进行md5加密，然后再进行比对
        password = DigestUtils.md5DigestAsHex(password.getBytes());
        if (!password.equals(employee.getPassword())) {
            //密码错误
            throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
        }

        if (Objects.equals(employee.getStatus(), StatusConstant.DISABLE)) {
            //账号被锁定
            throw new AccountLockedException(MessageConstant.ACCOUNT_LOCKED);
        }

        //3、返回实体对象
        return employee;
    }

    @Override
    public Result<String> insEmployee(EmployeeDTO employeeDTO) {
        Employee employee = new Employee();
        BeanUtils.copyProperties(employeeDTO, employee);
        employee.setPassword(DigestUtils.md5DigestAsHex(PasswordConstant.DEFAULT_PASSWORD.getBytes()));
        employee.setStatus(StatusConstant.ENABLE);
        if (employeeMapper.insEmployee(employee) == 0 ){
            return Result.error("新增失败！");
        }
        return Result.success("新增成功！");
    }

    /**
     * 分页查询 员工信息
     * @param employeePageQueryDTO 查询参数
     * @return 查询结果
     */
    @Override
    public Result<PageResult> getEmployeePageList(EmployeePageQueryDTO employeePageQueryDTO) {
        //使用分页查询
        PageHelper.startPage(employeePageQueryDTO.getPage(), employeePageQueryDTO.getPageSize());
        // 进行查询
        List<Employee> employeeList = employeeMapper.getEmployeePageList(employeePageQueryDTO);
        // 封装到PageInfo，PageInfo会自动获取分页信息
        PageInfo<Employee> pageInfo = new PageInfo<>(employeeList);
        long total = pageInfo.getTotal();
        PageResult pageResult = new PageResult(total, pageInfo.getList()) ;
        return Result.success(pageResult);
    }

    /**
     * 禁用员工
     * @param status 禁用状态
     * @param id 员工ID
     * @return 返回操作结果
     */
    @Override
    public Result<?> disableEmployeesStatus(String status, Long id) {
        // 更新用户禁用状态
        int update = employeeMapper.disableEmployeesStatus(status, id);
        if (update == 0){
            return Result.error("修改失败！");
        }
        return Result.success("修改成功！");
    }

    /**
     * 根据id查询员工信息
     * @param id 员工id
     * @return 员工信息
     */
    @Override
    public Result<?> getEmployeeById(Long id) {
        Employee employee = employeeMapper.getEmployeeById(id);
        if (ObjectUtils.isEmpty(employee)){
            return Result.error("为查询到id为" + id + "的员工信息");
        }
        return Result.success(employee);
    }

    /**
     * 编辑修改员工信息
     * @param employeeDTO 员工信息
     * @return 操作结果
     */
    @Override
    public Result<?> updateEmployee(EmployeeDTO employeeDTO) {
        Employee employee = new Employee();
        BeanUtils.copyProperties(employeeDTO, employee);
        int update = employeeMapper.updateEmployee(employee);
        if (update == 0){
            return Result.error("编辑失败请重试！");
        }
        return Result.success("编辑成功！");
    }

}
